mjmg commented on issue #8936: Issue on MXNet R installation with GPU support 
on Windows
URL: 
https://github.com/apache/incubator-mxnet/issues/8936#issuecomment-349325037
 
 
   These lines seems suspect:
   ```
   c:/Rtools/mingw_64/bin/g++ -I"C:/R-3.3.2/include" -DNDEBUG -I../inst/include 
-I"C:/R-3.3.2/library/Rcpp/include" -I"C:/TDM-GCC-64//include" -O2 -Wall 
-mtune=core2 -c executor.cc -o executor.o
   ...
   c:/Rtools/mingw_64/bin/g++ -I"C:/R-3.3.2/include" -DNDEBUG -I../inst/include 
-I"C:/R-3.3.2/library/Rcpp/include" -I"C:/TDM-GCC-64//include" -O2 -Wall 
-mtune=core2 -c im2rec.cc -o im2rec.o
   ```
   "C:/TDM-GCC-64//include" indicates you have the TDM GCC compiler include 
files referenced in your Include path. Rtools provides its own complete GCC 
toolchain. Rtools might attempt to include header files in the TDM GCC 
installation path which can lead to conflicts. 
   
   This one:
   ```
   im2rec.cc:20:30: fatal error: opencv2/opencv.hpp: No such file or directory
   #include <opencv2/opencv.hpp>
   ```
   seems to indicate problems finding the include path of the opencv 
installation.
   
   

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